About us Contact Us Submit BOM
RFQs(0)
English
Close Menu
View All

Please refer to the English Version as our Official Version.Return

Europe
France(Français) Germany(Deutsch) Italy(Italia) Russian(русский) Poland(polski) Czech(Čeština) Luxembourg(Lëtzebuergesch) Netherlands(Nederland) Iceland(íslenska) Hungarian(Magyarország) Spain(español) Portugal(Português) Turkey(Türk dili) Bulgaria(Български език) Ukraine(Україна) Greece(Ελλάδα) Israel(עִבְרִית) Sweden(Svenska) Finland(Svenska) Finland(Suomi) Romania(românesc) Moldova(românesc) Slovakia(Slovenská) Denmark(Dansk) Slovenia(Slovenija) Slovenia(Hrvatska) Croatia(Hrvatska) Serbia(Hrvatska) Montenegro(Hrvatska) Bosnia and Herzegovina(Hrvatska) Lithuania(lietuvių) Spain(Português) Switzerland(Deutsch) United Kingdom(English)
Asia/Pacific
Japan(日本語) Korea(한국의) Thailand(ภาษาไทย) Malaysia(Melayu) Singapore(Melayu) Vietnam(Tiếng Việt) Philippines(Pilipino)
Africa, India and Middle East
United Arab Emirates(العربية) Iran(فارسی) Tajikistan(فارسی) India(हिंदी) Madagascar(malaɡasʲ)
South America / Oceania
New Zealand(Maori) Brazil(Português) Angola(Português) Mozambique(Português)
North America
United States(English) Canada(English) Haiti(Ayiti) Mexico(español)
HomeProductsDiscrete Semiconductor ProductsTransistors - Bipolar (BJT) - SingleD44C6
Image may be representation.
See specifications for product details.
Share
 Favorite
EXPRESS OPTION
Payment method

D44C6 - Harris Corporation

Manufacturer Part Number
D44C6
Manufacturer
Harris Corporation
Allelco Part Number
98D-D44C6
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
5,392 pcs available, New & Original
Parts Description
TRANS NPN 45V 4A TO220
Package
TO-220
Data sheet
-
RoHs Status
 
Compare
Our certification
In stock: 5392

Required fields are indicated by an asterisk (*)
Please send RFQ, we will respond immediately.

Quantity

Specifications

D44C6 Tech Specifications
Harris Corporation - D44C6 technical specifications, attributes, parameters and parts with similar specifications to Harris Corporation - D44C6

Product Attribute Attribute Value
Manufacturer Harris Corporation
Voltage - Collector Emitter Breakdown (Max) 45 V
Vce Saturation (Max) @ Ib, Ic 500mV @ 50mA, 1A
Transistor Type NPN
Supplier Device Package TO-220
Series -
Power - Max 30 W
Package / Case TO-220-3
Product Attribute Attribute Value
Package Bulk
Operating Temperature -55°C ~ 150°C (TJ)
Mounting Type Through Hole
Frequency - Transition 50MHz
DC Current Gain (hFE) (Min) @ Ic, Vce 40 @ 200mA, 1V
Current - Collector Cutoff (Max) 10µA
Current - Collector (Ic) (Max) 4 A

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Affected
ECCN EAR99

Frequently Asked Questions(FAQ)

How does the D44C6's collector current rating compare to other NPN transistors in its voltage class, and what design implications does this have for high-current switching applications?
The D44C6 supports a maximum collector current of 4 A at a 45 V breakdown voltage, which is typical for mid-power NPN transistors but falls below higher-performance alternatives like those rated at 6–10 A. In high-current switching applications such as motor drives or power supplies, this limits the number of parallel devices required and affects thermal management complexity. Designers must ensure sufficient heatsinking to maintain junction temperatures below 150°C under continuous 4 A operation, especially when accounting for saturation voltage drops and ambient conditions.
What is the significance of the D44C6's transition frequency being 50 MHz, and how might this impact circuit performance in RF or high-speed digital switching scenarios?
With a transition frequency (fT) of 50 MHz, the D44C6 can handle moderate-speed switching applications such as PWM controllers or driver stages in switch-mode power supplies operating below 50 kHz. However, it is not suitable for RF amplification or high-speed logic-level switching above several hundred kilohertz due to increasing gain roll-off and phase delay. This places the device in the category of general-purpose power NPN transistors rather than high-frequency signal amplifiers.
Can the D44C6 be used in linear amplifier configurations, and what are the thermal limitations when operating near its maximum power dissipation?
Yes, the D44C6 can operate in linear mode, such as in audio output stages or current regulators. However, its maximum power dissipation is limited to 30 W under optimal thermal conditions—typically with a TO-220 package on a properly sized heatsink with minimal thermal resistance. For example, delivering 1 A at 20 V results in 20 W dissipation; continuous operation near this level without effective cooling risks exceeding the junction temperature limit of 150°C. Thermal derating curves should always be consulted to determine safe operating points based on actual case temperature.
How does the DC current gain (hFE = 40 @ 200mA, 1V) influence base drive requirements when using the D44C6 in saturated switch configurations?
A minimum hFE of 40 means that for a collector current of 1 A, the base current must be at least 25 mA (Ic/hFE). To achieve deep saturation (reducing Vce(sat)), designers often apply a base current 2–5 times higher than this minimum, so a 50–100 mA base drive may be needed depending on load conditions. This increases gate drive power consumption in control circuits but ensures lower conduction losses during ON-state operation.
What are the implications of the D44C6’s Vce(saturation) voltage of 500 mV at Ib = 50 mA, Ic = 1 A for efficiency in power-conversion applications?
At 1 A of collector current, the D44C6 exhibits a saturation voltage drop of 500 mV, resulting in a power loss of 500 mW per transistor during conduction. While acceptable in low-duty-cycle or moderate-efficiency designs, this contributes significantly to heat generation in continuous high-load scenarios. Compared to MOSFETs with millivolt-level on-resistance, bipolar transistors like the D44C6 are less efficient in high-current switching, making them better suited for discrete solutions where cost or simplicity outweighs efficiency concerns.
How does the operating temperature range (-55°C to +150°C TJ) affect reliability in automotive or industrial environments, and what precautions should be taken during PCB layout?
The wide junction temperature range (-55°C to +150°C) indicates robust construction suitable for harsh environments, including automotive under-hood applications. However, the actual case temperature will be lower due to thermal impedance between junction and ambient. During layout, ensure adequate copper area, thermal vias, and airflow to keep the TO-220 package within safe limits. Avoid placing heat-sensitive components directly adjacent to the device unless separated by thermal isolation.
What packaging and mounting considerations apply to the D44C6, and how does the TO-220 form factor influence heatsinking strategy?
The D44C6 uses a standard TO-220-3 package with a metal tab that connects to the collector pin, enabling direct attachment to a heatsink via insulating washers if necessary. Its through-hole design allows secure PCB mounting but requires careful mechanical support. The thermal resistance from junction to case (typically 1.5–2.5°C/W depending on manufacturer) dictates the need for a heatsink with total thermal resistance (case-to-ambient) well below 10°C/W to maintain safe temperatures under full load.
How does the D44C6 compare to similar NPN transistors like the TIP31 or 2N3055 in terms of voltage and current handling, and in what application would one be preferred over another?
Unlike the TIP31 (which has Vce(max) = 100 V, Ic(max) = 3 A) or 2N3055 (Vce = 60 V, Ic = 15 A), the D44C6 offers lower voltage and current ratings but operates at higher frequency (50 MHz vs. <10 MHz) and has lower saturation voltage. The D44C6 is better suited for lower-voltage, moderate-current applications requiring faster switching, such as LED drivers or small motor controllers, whereas the others are used in higher-power analog amplifiers or linear regulators.
Is the D44C6 RoHS compliant, and what does this mean for global manufacturing compliance and supply chain integration?
Yes, the D44C6 is RoHS3 compliant, meaning it meets European Union directives restricting hazardous substances like lead, mercury, and cadmium. This ensures compatibility with lead-free soldering processes and avoids regulatory issues in consumer electronics markets. Manufacturers sourcing the part can confidently integrate it into environmentally regulated product lines without additional certification burdens.
What is the moisture sensitivity level (MSL = 1) for the D44C6, and how does this affect storage and handling before PCB assembly?
With an MSL rating of 1, the D44C6 is considered non-critical for moisture absorption and can be stored indefinitely under normal dry storage conditions without baking prior to reflow soldering. This simplifies inventory management and reduces processing steps, making it ideal for high-volume production environments where shelf-life stability is important.
What are the key differences between the D44C6 and newer IGBT or MOSFET alternatives when used in switching power supplies?
Unlike IGBTs or MOSFETs, the D44C6 is a bipolar junction transistor (BJT) that relies on minority carrier injection, leading to higher conduction losses and slower turn-off times compared to unipolar devices. MOSFETs typically offer lower Rds(on) and no gate current draw, while IGBTs combine high-voltage capability with low saturation voltage. The D44C6 remains viable only where simplicity, cost, or legacy compatibility outweigh efficiency demands, such as in low-frequency boost converters or relay drivers.
How does the collector cutoff current (Iceo = 10 µA max) influence leakage behavior in high-impedance or precision analog circuits using the D44C6?
At 10 µA maximum, the reverse leakage current between collector and emitter is negligible in most analog applications, ensuring minimal offset error in high-gain amplifier stages or current mirrors. This low leakage supports stable biasing in thermally sensitive circuits and reduces dependency on temperature compensation networks, enhancing long-term drift performance in instrumentation-grade designs.
What role does the 50 MHz transition frequency play in determining the maximum usable gain-bandwidth product for signal amplification with the D44C6?
The transition frequency fT represents the frequency at which the current gain drops to unity (hfe = 1), marking the upper limit for effective amplification. With fT = 50 MHz, the D44C6 can provide useful voltage gain only up to approximately 1–5 MHz in common-emitter configurations, assuming reasonable load impedances. Beyond this, gain rolls off rapidly, limiting utility in wideband RF applications despite its moderate speed.
How should the D44C6 be protected during transient events such as inductive load switching, and what external components are typically required?
When driving inductive loads (e.g., relays or motors), a flyback diode must be placed across the load to clamp back-EMF. Additionally, snubber circuits (RC networks) may be added between collector and emitter to suppress voltage spikes caused by rapid turn-off. These measures prevent premature failure due to exceeding the 45 V collector-emitter breakdown voltage, particularly in repetitive switching environments.
In what types of power delivery systems would the D44C6 be a suitable choice, and why might it be selected despite the availability of more modern alternatives?
The D44C6 is appropriate for simple, low-to-medium power DC-DC converters, battery chargers, and linear voltage regulators operating below 20 W. It may be chosen for cost reasons, availability, or integration with legacy control ICs that interface well with bipolar outputs. Its TO-220 packaging also makes it easy to replace existing designs without major board changes, supporting migration paths in mature product lines.
How does the lack of a defined REACH status impact regulatory compliance when sourcing the D44C6 from different vendors?
The undefined REACH status suggests that individual Solid State Inc. suppliers may not uniformly report substance declarations, requiring buyers to obtain Material Safety Data Sheets (MSDS) or supplier-specific declarations before using the part in regulated products. This introduces due diligence overhead but does not inherently disqualify the component—provided each lot is verified against target market requirements (e.g., SVHC thresholds).
What are the trade-offs involved in choosing the D44C6 over a Darlington pair for switching applications requiring moderate gain and current drive?
While a Darlington configuration provides higher current gain (often >1000), it suffers from higher saturation voltage (typically 1–2 V), slower response, and reduced linearity. The D44C6 offers lower Vce(sat) (~0.5 V), better frequency response, and simpler drive requirements, making it preferable in applications where efficiency, speed, or thermal performance outweigh the need for very high input impedance or minimal base current.

Parts with Similar Specifications

The three parts on the right have similar specifications to Harris Corporation D44C6

Product Attribute D44C6 D44C9 D44C2 D44C11
Part Number D44C6 D44C9 D44C2 D44C11
Manufacturer Solid State Inc. Solid State Inc. Solid State Inc. Solid State Inc.
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Power - Max - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Current - Collector Cutoff (Max) - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Current - Collector (Ic) (Max) - - - -
Frequency - Transition - - - -
Series - - - -
Vce Saturation (Max) @ Ib, Ic - - - -
Voltage - Collector Emitter Breakdown (Max) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Transistor Type - - - -
DC Current Gain (hFE) (Min) @ Ic, Vce - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad

Customers Also Interested in

Recommended Products

Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

Write a Review

Your Email address will not be published.

Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
  • QC (Quality Warranty)
  • Payment Support
  • Packaging
  • Certifications & Memberships

QC (Quality Warranty)

Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


Strict quality inspection builds a solid foundation for electronic component quality.
  1. Visual inspection
  2. Performance testing and reliability verification
  3. Standardized full-process testing
  4. Precise control of every parameter
We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
Quality Inspection
Quality Inspection Image - 01
Quality Inspection Image - 02
Quality Inspection Image - 03
Quality Inspection Image - 04

Payment Support

The payment method can be chosen from the methods shown below: Wire Transfer (T/T, Bank Transfer), Western Union, Credit card, PayPal.
  • HKBea
  • Paypal
  • MasterCard
  • Western-Union
  • VISA
Stable Delivery, Sincere Partnership — Your Faithful Supply Chain Partner
  • Efficient Supply Management
  • Cost-Saving Procurement
  • Fast Sourcing & Delivery
Contact us if you have any questions.

Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


ESD

Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
  • ISO 13485: 2016
  • ISO 14001: 2015
  • ISO 28000: 2007
  • ISO 45001: 2018
  • GB/T 27922-2011
  • SMTA
  • IPC
  • ESD
  • PSMA

D44C6

Harris Corporation
98D-D44C6

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

Allelco
About Us
History
Certifications
Recruitment
Policies
Terms & Conditions
Privacy Policy
Cookie Policy
Services
Order Tracking
Return & Replacement
Frequently Asked Questions
Contact Us
Order
Shipping & Delivering
Payment Methods
My Account
The BlogsHot PartsChange LanguageNewsSite map
Contact Us
Headquarters Address:
Room C 13/F Harvard Commercial Building
105-111 Thomson Road Wan Chai
HongKong
Service Tel: +852-91464856
Service Email: info@allelco.com
Follow us
Copyright © 2012-2025 AllelcoElec.com. All rights reserved.
0 RFQ
Shopping cart (0 Items)
It is empty.
Submit RFQ
Compare List (0 Items)
It is empty.
Feedback

Your feedback matters! At Allelco, we value the user experience and strive to improve it constantly.
Please share your comments with us via our feedback form, and we'll respond promptly.
Thank you for choosing Allelco.

Subject
E-mail
Comments
Captcha
Drag or click to upload file
Upload File
types: .xls, .xlsx, .doc, .docx, .jpg, .png and .pdf.
Max file size: 10MB